I have seen oddly high tmeperatures with the Innovatek block and TbredAs; I never figured out whether it was mounting issue (cores are tiny), slight difference in height of the core (AMD doesn't mention it in specs if so), bad temp readings, or just a stupidly hot chip.
For using blocks that use the AMD holes, I almost always cut a hole in the motherboard tray use regular machine screws, and mount the springs on the backside of the motherboard. If you want to be able to close your case when done then you'll have to use pretty short screws and so the springs have to be slightly compressed to get the nuts on the end. This keeps the block flat the whole time you tighten down the nuts. It also makes it easy to get the same torque all around because there are no hoses in the way on the backside. Works great! Here's a pic:
